Major features of 9.0?

All,

Tommorrow is the end of CF4, and it's time to start working on the beta
announcement for our beta release.

To start with, I'd like to come up with our list of "big features" for
9.0 in addition to HS/SR.  The ones I can see are:

64-bit Windows Support
New Listen/Notify (event queueing support) -- if it makes it
Exclusion constraints
Default Privileges/Grant On ALL
DO() statement
Column Triggers
Function call named parameters
JSON/XML/YAML output for EXPLAIN
Deferrable Unique Constraints

Anything I'm missing?  We're going to have to narrow this down to a "big
5" or "big 6".

--Josh Berkus